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A pts method for reducing the low computational complexity of the ufmc system papr
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A technology of computational complexity and scheme, applied in transmission systems, multi-frequency code systems, digital transmission systems, etc., can solve problems such as high computational complexity, high BER, in-band and out-of-band interference, and simplify the operation process. Computational complexity reduction, the effect of low computational complexity
Active Publication Date: 2020-06-30
CHONGQING UNIV OF POSTS & TELECOMM
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Clipping technology is simple to implement, but it will cause in-band and out-of-band interference, resulting in higher BER
PTS technology, SLM technology and TR technology are all scrambling technologies, which scramble the input data block and transmit the data block with the smallest PAPR; this technology does not have the problem of out-of-band power, but the calculation complexity is high
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Embodiment 1
[0061] The PTS method of low computational complexity to reduce the PAPR of the UFMC system, refer to the attached Figure 1~3 , including the following steps:
[0062] (1) Establish a system model; the input data of the B subbands will be subjected to IFFT transformation to obtain s j =[s j (0),s j (1),...,s j (N-1)] T , j=(1,2,...B), s j After passing through a filter of length l, the time-domain sub-block sequence x is obtained j =[x j (0),x j (1),...,x j (N+l-1)] T , j=(1,2,...B);
[0063] (2) Analyze the system parameters of Universal Filtering Multi-Carrier (UFMC), determine the computational complexity PTS scheme of UFMC; divide B subband input data into V non-overlapping subblock sequences, each subblock contains K subband data; x m =[x m (0),x m (1),...,x m (N+l-1)] T , 1≤m≤V,
[0064] (3) Determine the selection criteria for peak power calculation sampling point and Q(n) threshold value α; that is, calculate Q=[Q(0), Q(1),...Q(N+l-1)] T , 0≤n≤N+...
Embodiment 2
[0124] The calculation method of the traditional PTS complexity is compared with the method in Embodiment 1 of the present invention.
[0125] The low-complexity PTS scheme is when the peak power of the system is greater than the minimum peak power Φ n The probability β is certain under certain circumstances (such as, Calculate the set S Q (α)={n|Q(n)≥α, 0≤n≤N-1} the PAPR value after multiplying the sampling point and the phase rotation factor vector, and select the optimal phase rotation factor vector.
[0126] Let α at this time be α β ,and When considering the oversampling factor L, the set S Q (α β ) The number of sampling points is
[0127] Step1, perform IFFT transformation on the input data of B subbands, the required real number addition and complex number multiplication are respectively and
[0128] Step2, the K subband data are superimposed on each other, and the required real number addition and complex number multiplication are 2V{(K-1)(LN+l-1)} and ...
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Abstract
An embodiment of the present invention discloses a low calculation complexity PTS method (LC-PTS) of lowering a PAPR of a UFMC system. Differences between a general filter multi-carrier system and an OFDM system are analyzed, so as to suggest segmenting based on the sub-band of the general filter multi-carrier system; then, a threshold of system minimum peak power is preset, and time domain sampling points are reduced in selection of an optimal phase combination; and finally, calculation complexity of some candidate sequences is lowered according to a relationship of phase weighing sequences. When a probability beta that the system peak power is greater than possible minimum peak power is greater than 0.5, the LC-PTS method is almost identical to traditional PTS methods in performance, but is sharply reduced in calculation amount.
Description
technical field [0001] The invention relates to the technical field of wireless mobile communication, in particular to a PTS method for reducing PAPR of a UFMC system with low computational complexity. Background technique [0002] In order to solve the challenges brought by a large number of applications of the Internet of Things (IoT) and Machine Type Communication (MTC) in the fifth generation mobile communication system (such as reducing signaling overhead, reducing the synchronization requirements of the air interface, etc.), a filter bank-based Multi-carrier FBMC transmission system, universal filter multi-carrier (UFMC) transmission system candidates and other multi-carrier transmission technologies. High peak-to-average power ratio is one of the main problems in the development of general-purpose filter multi-carrier technology. High peak-to-average power ratio can easily cause power amplifiers to fail, causing problems such as in-band distortion and out-of-band leak...
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